(19)
(11) EP 0 147 659 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
22.04.1987 Bulletin 1987/17

(43) Date of publication A2:
10.07.1985 Bulletin 1985/28

(21) Application number: 84114479

(22) Date of filing: 29.11.1984
(84) Designated Contracting States:
DE FR GB SE

(30) Priority: 02.12.1983 JP 22817483

(71) Applicant: KAWASAKI STEEL CORPORATION
 ()

(72) Inventors:
  • Inokuti, Yukio c/o Gijutsu-Kenkyu-sho
     ()
  • Kobayashi, Yasuhiro c/o Gijutsu-Kenkyu-sho
     ()
  • Ito, Yo c/o Gijutsu-Kenkyu-sho
     ()

   


(54) Method for manufacturing grain-oriented silicon steel sheet


(57) A method for obtaining grain-oriented silicon steel sheet with a very high magnetic flux density and a very low core loss by setting specific conditions for the decarburization and primary recrystallization annealing step within the series of steps performed for the manufacture of the grain-oriented silicon steel sheet. This method consists of setting the rate of temperature rise in the decarburization and primary recrystallization annealing step at no less than 10°C/sec, dividing the decarburization and primary recrystallization annealing step into a first half and a second half, and restricting the temperature, time, and ratio PH2O/PH2 of the partial pressure of H2O to the partial pressure of H2 of the atmosphere for each of these two halves within certain predefined ranges.






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